8 



8. On Amygdaloidal Structure and Vein Formation, with special 

 Reference to the Copper-bearing Rocks of Keweenaw Point, Lake 

 Superior : being a Reply to Professor James D. Dana. Proc. Bost. Soc. 

 Nat. Hist., 1880, XXL 91-103. 



9. The Appropriation of the Name Laurentian by the Canadian Geolo- 

 gists. Ibid., 1881, pp. 121, 122. 



By Edward R. Benton, Ph. D. 



10. The Amygdaloidal Melaphyr of Brighton, Mass. Proc' Bost. Soc. 

 Nat. Hist., 1880, XX. 416-426, with plate. 



By J. S. DiLLER, Candidate for the degree of Sc.D. 



11. The Felsites and their Associated Rocks north of Boston. Bull. 

 Mus. Comp. Zool., 1881, Geol. Ser. 1. 165-180. 



The chief portion of the material prepared for publication 

 during the past year by Dr. Wadsworth remains in manuscript, 

 awaiting revision and completion. 



The work of arranging and describing the lithological col- 

 lection has been continued from time to time, as other duties 

 permitted. The collection has been increased by additions from 

 various sources. Among these additions may be mentioned a 

 suite of specimens from Salvador, received from Mr. W. A. Good- 

 year, the head of the Geological Survey of that State. Of these 

 slides have been prepared, and a preliminary catalogue made of 

 the specimens, 146 in number. From Europe 101 hand specimens 

 have been obtained by purchase, and 122 slides. These were 

 especially selected for purposes of comparison and study. Speci- 

 mens illustrating the local lithology have been added from 

 time to time, and some have been collected by Dr. Wadsworth 

 in New Brunswick. Some interesting things were obtained by 

 the Sturgis-Hooper Professor in Europe, and especially two masses 

 of basalt containing native iron, from Ovifak, in Greenland. 

 These were presented by Professor Johnstrup of Copenhagen. 

 Mr. J. H. Huntington has also presented some valuable specimens 

 collected by himself in Arizona and Mexico. He has from time 

 to time continued the work of preparing thin sections for the 

 microscopic examination of the collection. The slides now on 

 hand amount to 1839 in number. 



The Sturgis-Hooper Professor lectured from the beginning of 

 the college year until the middle of May, giving two distinct 



